The discovery of dwarf planet Eris was announced by astronomers on 29th July 2005. The heavenly body was discovered in January of the year at the Palomar Observatory by Mike Brown, C. A. Trujillo and D. L. Rabinowitz. This team of astronomers also discovered the trans-Neptunian object, in 2003.
Eris is the second-largest known dwarf planet in our solar system and is 27% more massive than Pluto though Pluto is larger by volume. And because of this, NASA described Eris as the tenth planet. On 21st October 2005, images of the planet were taken to be used in documenting its discovery.
The dwarf planet also has a moon which has been named Dysnomia which was discovered at the W. M. Keck Observatory at Kamuela, Hawaii.
The first animal to be put in orbit was, Laika, a stray dog from the streets of Moscow. [more...]